condition	mean	min	max
4 h after light	7.139193333333333	7.04921	7.28415
8 h after light	6.74126	6.69262	6.7715
12 h after light	6.92006	6.82949	6.98345
4 h after dark	6.893006666666667	6.7032300000000005	7.1574800000000005
8 h after dark	7.02373	6.799919999999999	7.20534
12 h after dark	6.96609	6.75818	7.28035